[vsnet-grb-info 9740] GRB 100901A: UKIRT zYJHK Observation
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Sep 4 23:41:21 JST 2010
TITLE: GCN CIRCULAR
NUMBER: 11208
SUBJECT: GRB 100901A: UKIRT zYJHK Observation
DATE: 10/09/04 14:41:16 GMT
FROM: Myungshin Im at Seoul Nat U <mim at astro.snu.ac.kr>
Myungshin Im, Changsu Choi, Hyunsung Jun, Eugene Kang (CEOU/Seoul
National University), Y. Urata (NCU), P. Choi (Pomona College),
T. Sakamoto (NASA/GSFC), N. R. Tanvir (U. Leicester), and A. Levan
(U. Warwick) on behalf of a larger collaboration
We observed GRB 100901A (Immler et al. GCN 11159) in z, Y, J, H,
and K filters using UKIRT. The observation started at Sept. 04,
10:49:31 UT or roughly 2.88 days after the BAT alert.
We detect the afterglow in images in all the filters,
with a preliminary magnitude of K=17.82 +- 0.2 mag (Vega)
calibrated against a 2MASS star at RA=01h49m05.59s and Dec=22d44m51.86s.
The K-band magnitude is consistent with an expected brightness
in NIR assuming fading of the brightness with alpha=1.2 a spectral
slope of beta=0.6 since the report of Kann et al. (GCN 11187).
Further observation of the object is ongoing.
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